Complex of water-soluble CdSe/ZnS quantum dots and chlorin e6: interaction and FRET

J. Valanciunaite; A. Skripka; G. Streckyte; R. Rotomskis

doi:10.1117/12.871524

24 November 2010 Complex of water-soluble CdSe/ZnS quantum dots and chlorin e₆: interaction and FRET

J. Valanciunaite, A. Skripka, G. Streckyte, R. Rotomskis

Proceedings Volume 7376, Laser Applications in Life Sciences; 737607 (2010) https://doi.org/10.1117/12.871524
Event: Laser Applications in Life Sciences 2010, 2010, Oulu, Finland

Abstract

In this work we present the spectral study on complex formation between CdSe/ZnS-amino (620 nm) quantum dots (QDs) and second-generation photosensitizer chlorin _e6 (Ce₆). In the presence of QDs, significant changes in the absorption and fluorescence properties of Ce6 were observed. The fluorescence spectrum of bound Ce₆ molecules displayed the new intensive fluorescence band at 670 nm, similar to that observed in organic solvent chloroform. With an increase in QDs:Ce₆ molar ratio up to 1:20, the spectrum of QDs-Ce₆ showed the decrease in intensity of QDs fluorescence band at 620 nm, while the intensity of fluorescence band at 670 nm was increasing simultaneously. The fluorescence excitation spectrum of bound Ce₆ molecules exposed a contribution of QDs spectrum. The fluorescence decay measurements of QDs-Ce₆ solution displayed the shortening of QDs fluorescence lifetime at increasing Ce₆concentration. We conclude, that Ce₆ molecules interact with the hydrophobic groups of QDs coating, which results in the changes of spectral properties of Ce₆. Upon binding, Ce₆ molecules are located close enough to the shell/core of QDs for Förster resonance energy transfer (FRET) from QDs to Ce₆ to occur.

Citation Download Citation

J. Valanciunaite, A. Skripka, G. Streckyte, and R. Rotomskis "Complex of water-soluble CdSe/ZnS quantum dots and chlorin e₆: interaction and FRET", Proc. SPIE 7376, Laser Applications in Life Sciences, 737607 (24 November 2010); https://doi.org/10.1117/12.871524

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available